<template>
	<div class="shopcart-container">
		<!-- 全选 清空 -->
		<div class="cart_header">
			<div class="cart_title">
				<!-- 全选 -->
				<van-checkbox checked-color="#000000" icon-size="18" v-model="isCheckedAll" @click="onSelectAll">全选
				</van-checkbox>
			</div>
			<div class="cart_clear" @click="onClickDeleteAll">
				<van-icon name="delete" />
				<span>清空</span>
			</div>
		</div>
		<!-- 商品列表区域 -->
		<div style="background-color: white;">
			<van-row v-for="(item, i) in cartList" :key="i" type="flex" align="center">
				<van-col span="2">
					<!-- 复选框 -->
					<van-checkbox v-model="item.is_checked" @change="onCheckedChange(item)" />
				</van-col>
				<van-col span="5">
					<!-- 中间商品图片 -->
					<van-icon size="80" :name="APIDomainName + item.pic"></van-icon>
				</van-col>
				<van-col span="17">
					<van-row class="van-multi-ellipsis--l2 title">{{ item.title }}</van-row>
					<van-row type="flex" align="center">
						<van-col span="8" class="price">¥{{ item.price }}</van-col>
						<van-col span="16" class="opration">
							<van-stepper v-model="item.count" @change="onCountChanged(item)" integer />
							<van-button text="删除" size="small" @click.prevent="onClickDeleteCartItem(item.id)" />
						</van-col>
					</van-row>
				</van-col>
			</van-row>
		</div>
		<!-- 商品结算区域 -->
		<van-cell title="商品结算" value="总计不含运费"></van-cell>
		<van-cell>
			<template #title>
				已勾选商品<span class="red">{{ getCheckedCount }}</span>
				件，总价
				<span class="red">¥{{ getCheckedAmount }}</span>
			</template>
		</van-cell>
		<!-- 结算按钮 -->
		<van-button type="primary" size="large" @click="onClickCreateOrder">去结算</van-button>
	</div>
</template>
<script>
	import {
		getCartListAPI,
		updateCartCountAPI,
		updateCartCheckedAPI,
		deleteCartItemAPI,
		deleteCartAllAPI, //删除清空购物车接口
		updateCartCheckedAllAPI, //全选/全不选购物车项接口
	} from "@/api/cart.js";
	export default {
		data() {
			return {
				cartList: [],
				isCheckedAll: false, //是否全选
			};
		},
		created() {
			this.getCartData();
		},
		computed: {
			getCheckedCount() { //计算勾选记录总数
				let sum = 0;
				this.cartList.forEach((item) => {
					if (item.is_checked) sum += 1;
				});
				return sum;
			},
			getCheckedAll() { //计算是否全部勾选
				return this.cartList.length == this.getCheckedCount ? true : false;
			},
			getCheckedAmount() {
				let amount = 0;
				this.cartList.forEach((item) => {
					if (item.is_checked) amount += item.price * item.count;
				});
				return amount;
			},
		},
		methods: {
			onClickCreateOrder() {
				if (this.cartList.length === 0) {
					this.$toast("您的购物车为空");
					return;
				}
				//要确保购物车数据和后端数据库的是一致的 .....
				this.$router.push({
					name: "orderCreate"
				});
			},

			//获取用户购物车数据
			getCartData() {
				this.cartList = []; //清空
				getCartListAPI().then(result => {
					this.cartList = result.data;
					this.isCheckedAll = this.getCheckedAll; // 重置isCheckedAll属性值
				}).catch(() => {});
			},
			//触发更改购物商品数量
			onCountChanged(item) {
				let params = {
					id: item.id,
					count: item.count
				};
				updateCartCountAPI(params).then(() => {});
			},

			//触发更改购物商品选中状态
			onCheckedChange(item) {
				let id = item.id;
				let is_checked = item.is_checked == true ? 1 : 0;
				let params = {
					id,
					is_checked
				};
				updateCartCheckedAPI(params).then(() => {}).catch(() => {
					this.isCheckedAll = this.getCheckedAll; // 重置isCheckedAll属性值
				});
			},

			//触发删除购物商品
			onClickDeleteCartItem(id) {
				let ids = id;
				deleteCartItemAPI(ids).then(() => {
					this.getCartData();
				});
			},
			onSelectAll() {
				let is_checked = this.isCheckedAll == true ? 1 : 0;
				updateCartCheckedAllAPI(is_checked).then(() => {
					this.getCartData();
				});
			},
			//触发清空
			onClickDeleteAll() {
				this.$dialog.confirm({
					message: '客官，您确定清空购物车吗?'
				}).then(() => {
					deleteCartAllAPI().then(() => {
						this.getCartData();
					});
				})
			},
		},
	};
</script>
<style lang="less" scoped>
	.shopcart-container {
		padding: 0px 10px;

		.cart_header {
			padding: 10px;
			margin: 10px 0;
			height: 20px;
			background-color: white;
			display: flex;
			justify-content: space-between;
			align-items: center;
		}
	}

	.van-checkbox {
		justify-content: center;
	}

	.title {
		padding: 5px 5px;
		font-size: 12px;
		line-height: 20px;
	}

	.red {
		color: red;
		font-weight: bold;
		font-size: 16px;
	}

	.price {
		padding-left: 10px;
		text-align: left;
		font-size: 16px;
		font-weight: bold;
		color: red;
		display: flex;
		align-items: center;
	}

	.opration {
		padding-right: 10px;
		display: flex;
		align-items: center;
		justify-content: flex-end;
	}

	.red {
		color: red;
		font-weight: bold;
		font-size: 16px;
	}
</style>